FA-53165 / Raster memory layout / Member archive

Page Split Texel Spans: Second page transfer repeats full texel or is always suppressed · case 05

The returned physical layout descriptor disagrees with the declared buffer mapping at remaining.

Member previewVariant 5 · 3 implementations · 6 checks per implementation

Case contract

Raster texels contain six bytes and may straddle 16-byte virtual pages. A virtual byte span maps through a noncontiguous physical page directory; output contains source spans and offsets for reassembling one texel. Return the named intermediate layout descriptor and final address fields; all quantities are integer byte offsets unless explicitly stated.

Why this case matters

Offline raster resource, upload, readback, and storage-layout regression model.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
layout fixture 1	`{"byte_addresses": [33, 34, 35, 36, 37, 38, 160, 161, 162, 163, 164, 165], "destination_offsets": [0, 6], "first_bytes": 6, "first_page": 4, "first_physical": 33, "page_offset": 1, "remaining": 6, "second_physical": 160, "spans": [[33, 6], [160, 6]], "virtual_start": 65}`	`{"byte_addresses": [33, 34, 35, 36, 37, 38], "destination_offsets": [0], "first_bytes": 6, "first_page": 4, "first_physical": 33, "page_offset": 1, "remaining": 0, "second_physical": 160, "spans": [[33, 6]], "virtual_start": 65}`	Failed

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